Where do you hide yours?
Do you have a special folder on the computer, that is named something so boring that no-one checks it?
Maybe you keep your digital porn on a secret removable drive, which you stash away under your mattress (like you used to do when you had dirty magazines)?
Perhaps you are one of the modern breed that openly looks at online porn and even shares it with your wife/husband/partner/cat/dog, etc.
But no matter how grownup and modernly adventurous you become, I will bet you still don’t want to let your mum find it.